CN107291576A - A kind of uncoupled method and device of asynchronous snapped volume - Google Patents
A kind of uncoupled method and device of asynchronous snapped volume Download PDFInfo
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- CN107291576A CN107291576A CN201710458142.6A CN201710458142A CN107291576A CN 107291576 A CN107291576 A CN 107291576A CN 201710458142 A CN201710458142 A CN 201710458142A CN 107291576 A CN107291576 A CN 107291576A
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- snapshot
- data block
- bitmap
- data
- snapped volume
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1446—Point-in-time backing up or restoration of persistent data
- G06F11/1458—Management of the backup or restore process
- G06F11/1469—Backup restoration techniques
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1471—Saving, restoring, recovering or retrying involving logging of persistent data for recovery
Abstract
The invention discloses a kind of decoupling method and device of asynchronous snapped volume, when this method includes detecting the first snapshot for pre- deletion state and first snapshot generation copy-on-write, the second snapshot dependent on first snapshot is judged whether；If so, the data block data relied in first snapshot by the data block in second snapshot is then copied, into the corresponding data block of second snapshot.As can be seen here, the uncoupled method of snapped volume that the present invention is provided, it is to be completed when snapshot produces copy-on-write on backstage that copy, which is relied on data block data this operation, that is completed before delete command is received, so directly snapshot to be deleted can be deleted after delete command is received, it is not necessary to carry out copy function again.Therefore, the uncoupled method of snapped volume that the present invention is provided, when there is dependence between snapped volume, deletes speed and is significantly improved, host performance has also obtained significantly optimizing.
Description
Technical field
The present invention relates to storage calamity for field, more specifically to a kind of decoupling method of asynchronous snapped volume and dress
Put.
Background technology
With the raising of storage application demand, user needs to reduce the cost of data protection, improves in data protection process
Application perception, snapshot technology into one of effective ways to solve this problem, its respond it is fast, do not influence main frame
Performance.Definition of the storage networking industry association (SNIA) to snapshot be：A completely available copy to specifying data acquisition system, should
Copy includes static image of the source data in copy time point.Snapping technique is the duplication based on time point, therefore can be rolled back to
Any one Snapshot time point.
With the continuous increase of data volume, user needs to create multiple snapshots to source data, or even needs to create multiple levels
Join snapshot, to ensure the data backup at multiple time points.When snapshot and cascade snapshot number it is more when, on the one hand in order to ensure close
Key data and frequency higher data are not lost and can recovered, on the one hand in order to save carrying cost and capacity, it is necessary to by frequency of usage
Relatively low, non-key data snapshot is deleted.
In the prior art, when there is dependence between snapped volume, deleting snapshot needs snapshot to be deleted being relied on
Data block data copy in the snapped volume for relying on this snapshot because the process of copy is needed to receive delete command laggard
OK, thus prior art delete snapshot method delete speed it is low, host performance can be also influenceed to a certain extent.
Therefore, the deletion speed for snapshot how being provided while snapped volume dependence is released is those skilled in the art's needs
The problem of solution.
The content of the invention
It is an object of the invention to provide a kind of decoupling method and device of asynchronous snapped volume, with solve snapped volume it
Between delete the problem of speed is relatively low when there is dependence.
To achieve the above object, the embodiments of the invention provide following technical scheme：
A kind of decoupling method of asynchronous snapped volume, including：
Whether detect the first snapshot is pre- deletion state；
If so, then being judged whether when first snapshot produces copy-on-write dependent on first snapshot
Second snapshot；
If, it is determined that the data block relied in first snapshot by the data block in second snapshot；
The data block data relied in first snapshot by the data block in second snapshot is copied, to described second
In the corresponding data block of snapshot.
Wherein, before whether the first snapshot of the detection is pre- deletion state, in addition to：
Snapshot is set to be pre- deletion state and be that the snapshot sets and deletes speed, wherein, all pre- deletion snapshots tools
There is identical to delete speed, or each pre- snapshot of deleting has respective deletion speed.
Wherein, in addition to：Receive after deletion snapshot command, according to deletion speed set in advance by first snapshot and
Data in first snapshot are deleted.
Wherein, in addition to：For the data block of snapshot, bitmap is set, wherein, the initial bitmap of data block is when creating snapshot
0, bitmap is revised as 1 by snapshot data block when producing copy-on-write.
Wherein, the data block for determining to be relied on by the data block in the second snapshot in first snapshot includes：
The bitmap of first snapshot data block is made into inverse；
The result of the first snapshot data bitmap block inverse and the second snapshot data bitmap block are made and computing；
Obtained bitmap is the data block relied on by the data block in the second snapshot in the first snapshot by 1 data block.
To achieve the above object, the embodiments of the invention provide following device, including：
Detection module, for detecting whether the first snapshot is pre- deletion state；
Determining module, during for detecting the first snapshot for pre- deletion state and first snapshot generation copy-on-write,
The second snapshot dependent on first snapshot is judged whether, if, it is determined that by described second in first snapshot
The data block that data block in snapshot is relied on；
Module is copied, for copying the data block number relied in first snapshot by the data block of second snapshot
According into the corresponding data block of second snapshot.
Wherein, in addition to：Removing module, is deleted after snapshot command for receiving, will according to deletion speed set in advance
Data in first snapshot and first snapshot are deleted.
Wherein, in addition to：Setup module, for setting snapshot to be pre- deletion state and being that snapshot to be deleted sets deletion speed
Rate, wherein, there is all pre- deletion snapshots identical to delete speed, or each pre- snapshot of deleting has respective deletion speed
Rate.
Wherein, the setup module also includes：
Bitmap unit is set, for setting bitmap for the data block of snapshot, wherein, the initial bit of data block when creating snapshot
Figure is 0, and bitmap is revised as 1 by snapshot data block when producing copy-on-write.
Wherein, the determining module also includes：
Judging unit, for judging whether the second snapshot dependent on first snapshot；
Arithmetic element, for when there is the second snapshot dependent on first snapshot, by first snapshot data
The bitmap of block makees inverse, by the result of the first snapshot data bitmap block inverse and the second snapshot data bitmap block
Make and computing；
Determining unit, for obtained bitmap to be defined as in the first snapshot by the number in the second snapshot for 1 data block
The data block relied on according to block.
By above scheme, the decoupling method of asynchronous snapped volume provided in an embodiment of the present invention, this method includes
Whether detect the first snapshot is pre- deletion state；If so, then being judged whether when first snapshot produces copy-on-write
The second snapshot dependent on first snapshot；If, it is determined that by the data in second snapshot in first snapshot
The data block that block is relied on；The data block data relied in first snapshot by the data block in second snapshot is copied,
Into the corresponding data block of second snapshot.As can be seen here, the uncoupled method of snapped volume that provides of the present invention, copy by according to
It is to be completed when snapshot produces copy-on-write on backstage to rely this operation of data block data, that is to say, that be to receive deletion life
Completed before order, so directly can be deleted snapshot to be deleted after delete command is received, it is not necessary to copied again
Operation.Therefore, the uncoupled method of snapped volume that the present invention is provided, when there is dependence between snapped volume, deletes speed
It is significantly improved, host performance has also obtained significantly optimizing.The invention also discloses a kind of asynchronous snapped volume
Decoupling device, can equally realize above-mentioned technique effect.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of flow chart of the decoupling method of asynchronous snapped volume disclosed in the embodiment of the present invention；
Fig. 2 is the flow chart of another decoupling method of asynchronous snapped volume disclosed in the embodiment of the present invention；
Fig. 3 is the specific embodiment of another decoupling method of asynchronous snapped volume disclosed in the embodiment of the present invention；
Fig. 4 is a kind of structure chart of asynchronous snapped volume decoupling device disclosed in the embodiment of the present invention；
Fig. 5 is the structure chart of another asynchronous snapped volume decoupling device disclosed in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The embodiment of the invention discloses a kind of decoupling method of asynchronous snapped volume, with solve to exist between snapped volume according to
The problem of speed is relatively low is deleted during the relation of relying.
Referring to Fig. 1, a kind of flow chart of the decoupling method of asynchronous snapped volume provided in an embodiment of the present invention.Such as Fig. 1 institutes
Show, including：
S101：Whether detect the first snapshot is pre- deletion state；If so, then performing S102；If it is not, then terminating flow；
On the basis of above-described embodiment, preferably embodiment, in addition to：Snapshot is set to delete state simultaneously to be pre-
Set for the snapshot and delete speed, wherein, there is all pre- deletion snapshots identical to delete speed, or each delete in advance fast
According to respective deletion speed.
, can be in the random time after creating snapshot or creating snapshot in specific implementation, it is pre- deletion to set snapshot
State, and speed is deleted for its setting, each pre- deletion speed for deleting snapshot can be any numerical value corresponded to actual needs,
Can all identical, part it is identical, can also be all different, herein and be not especially limited.Detect the presence of state and delete shape to be pre-
Next step is carried out during the snapshot of state.
S102：When first snapshot produces copy-on-write, the dependent on first snapshot is judged whether
Two snapshots；If so, then performing S103；If it is not, then terminating flow；
S103：Determine the data block relied in first snapshot by the data block in second snapshot；
In specific implementation, when producing copy-on-write in the pre- snapshot for deleting state, it is possible to use the side of bitmap computing
Formula determines the pre- data block deleted and relied in snapshot by another snapshot.
S104：The data block data relied in first snapshot by the data block in second snapshot is copied, to institute
State in the corresponding data block of the second snapshot.
In specific implementation, it is necessary to when snapshot to be deleted produces copy-on-write, by the pre- number deleted and be relied in snapshot
According in block copy to the corresponding data block for relying on this snapshot；It should be noted that including setting pre- deletion state, data to copy above
The operation such as shellfish is all to be completed when snapshot produces copy-on-write on backstage.
On the basis of above-described embodiment, preferably embodiment, in addition to：Receive after deletion snapshot command, press
Data in first snapshot and first snapshot are deleted according to deletion speed set in advance.
In specific implementation, copy is relied on data block data and completed when snapshot produces copy-on-write, that is,
Say and completed before delete command is received, so directly can be deleted snapshot to be deleted after delete command is received,
Other operations need not be carried out again.
The decoupling method of asynchronous snapped volume provided in an embodiment of the present invention, this method include detection the first snapshot whether be
It is pre- to delete state；If so, then judging whether to depend on first snapshot when first snapshot produces copy-on-write
The second snapshot；If, it is determined that the data block relied in first snapshot by the data block in second snapshot；Copy
The data block data relied in first snapshot described in shellfish by the data block in second snapshot, it is corresponding to second snapshot
In data block.As can be seen here, the uncoupled method of snapped volume that provides of the present invention, copy is relied on data block data this operation
It is to be completed when snapshot produces copy-on-write on backstage, that is to say, that completed before delete command is received, so
Receive directly can delete snapshot to be deleted after delete command, it is not necessary to carry out copy function again.Therefore, the present invention is provided
The uncoupled method of snapped volume, when there is dependence between snapped volume, delete speed be significantly improved, main frame
It can also obtain significantly optimizing.
The embodiment of the invention discloses a kind of specific decoupling method of snapped volume, relative to a upper embodiment, this implementation
Example has made further instruction and optimization to technical scheme.Specifically further comprise：For the data block of snapshot, bitmap is set, its
In, the initial bitmap of data block is 0 when creating snapshot, and bitmap is revised as 1 by snapshot data block when producing copy-on-write.
Referring to Fig. 2, the flow chart of another decoupling method of asynchronous snapped volume provided in an embodiment of the present invention.Such as Fig. 2
It is shown, including：
S201：Whether detect the first snapshot is pre- deletion state；If so, then performing S202；If it is not, then terminating flow；
S202：When first snapshot produces copy-on-write, the dependent on first snapshot is judged whether
Two snapshots；If so, then performing S203；If it is not, then terminating flow；
S203：The bitmap of first snapshot data block is made into inverse, then by the result of inverse and the second snapshot
Data bitmap block is made and computing, the data block that obtained bitmap is 1 be in the first snapshot by the data block institute in the second snapshot according to
Bad data block.
S204：The data block data relied in first snapshot by the data block in second snapshot is copied, to institute
State in the corresponding data block of the second snapshot.
For example, with reference to Fig. 3, the specific implementation of another decoupling method of asynchronous snapped volume provided in an embodiment of the present invention
Example.As shown in figure 3, Src is source book, comprising four data blocks, primary data is AAAA, and initial bitmap is 0000.T0 moment, wound
Build snapshot Tgt0, source book Src the 3rd, 4 data blocks do not write B, C, according to copy-on-write principle, by Src the 3rd, 4 data blocks
A, A are individually copied in the corresponding data blocks of Tgt0, and bitmap is changed into 0011.At the T1 moment, create snapshot Tgt1, the of source book Src
1st, 4 data blocks do not write D, E, according to copy-on-write principle, Src the 1st, 4 data blocks A, C are individually copied into Tgt1 corresponding
In data block, bitmap is changed into 1001.
Backstage setting snapshot Tgt1 is pre- deletion state and is that it sets deletion speed, detects snapshot Tgt1 and is deleted to be pre-
State,, will because the snapshot Tgt0 earlier generated depends on newer snapshot Tgt1 when copy-on-write occurs on snapshot Tgt1
The bitmap of snapshot Tgt0 data blocks makees inverse, then makees the result of inverse and snapshot Tgt1 data bitmap block and computing,
Obtained bitmap 1000, it is known that the 1st data block, will by the data block relied in snapshot Tgt1 by snapshot Tgt0 data block
The 1st data block A is copied in snapshot Tgt0 the 1st data block in snapshot Tgt1, and now snapshot Tgt0 is AXAA.
Receive after deletion snapshot command, delete snapshot Tgt1 and its data block data according to deletion speed set in advance
Remove, without carrying out any back-end data copy.
Snapped volume decoupling device provided in an embodiment of the present invention is introduced below, snapped volume decoupling described below
Attach together that put can be with cross-referenced with the decoupling method of above-described snapped volume.
Referring to Fig. 4, a kind of structure chart of asynchronous snapped volume decoupling device provided in an embodiment of the present invention, such as Fig. 4 institutes
Show, including：
Detection module 100, for detecting whether the first snapshot is pre- deletion state；
On the basis of above-described embodiment, preferably embodiment, in addition to：Setup module, for setting snapshot
For pre- deletion state and be that snapshot to be deleted sets and deletes speed, wherein, the deletion speed includes all pre- deletion snapshots
Speed is deleted with identical, or each pre- snapshot of deleting has respective deletion speed.
Determining module 200, is pre- deletion state and first snapshot generation copy-on-write for detecting the first snapshot
When, the second snapshot dependent on first snapshot is judged whether, if, it is determined that by described the in first snapshot
The data block that data block in two snapshots is relied on；
Module 300 is copied, for copying the data block relied in first snapshot by the data block of second snapshot
Data, into the corresponding data block of second snapshot.
On the basis of above-described embodiment, preferably embodiment, in addition to：Removing module, for receiving deletion
After snapshot command, data in first snapshot and first snapshot are deleted according to deletion speed set in advance.
The embodiment of the invention discloses a kind of snapped volume decoupling device, relative to a upper embodiment, the present embodiment is to skill
Art scheme has made further instruction and optimization.Specifically further comprise：Bitmap unit is set, for the data block for snapshot
Bitmap is set, wherein, the initial bitmap of data block is 0 when creating snapshot, and snapshot data block repaiies bitmap when producing copy-on-write
It is changed to 1.
Referring to Fig. 5, the structure chart of another asynchronous snapped volume decoupling device provided in an embodiment of the present invention, such as Fig. 5
It is shown, including：
Detection module 100, for detecting whether the first snapshot is pre- deletion state；
Judging unit 201, for judging whether the second snapshot dependent on first snapshot；
Arithmetic element 202, for when there is the second snapshot dependent on first snapshot, by the first snapshot number
Make inverse according to the bitmap of block, by the result of the first snapshot data bitmap block inverse and second snapshot data block position
Figure is made and computing；
Determining unit 203, for obtained bitmap to be defined as in the first snapshot by the second snapshot for 1 data block
The data block that data block is relied on.
Module 300 is copied, for copying the data block relied in first snapshot by the data block of second snapshot
Data, into the corresponding data block of second snapshot.
Asynchronous snapped volume decoupling device provided in an embodiment of the present invention, the device copy be relied on data block data this
One operation is to be completed when snapshot produces copy-on-write on backstage, that is to say, that completed before delete command is received,
So directly snapshot to be deleted can be deleted after delete command is received, it is not necessary to carry out copy function again.Therefore, this hair
The uncoupled device of snapped volume of bright offer, when there is dependence between snapped volume, deletes speed and is significantly improved,
Host performance has also obtained significantly optimizing.
The embodiment of each in this specification is described by the way of progressive, and what each embodiment was stressed is and other
Between the difference of embodiment, each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (10)
1. a kind of decoupling method of asynchronous snapped volume, it is characterised in that including：
Whether detect the first snapshot is pre- deletion state；
If so, then judging whether second dependent on first snapshot when first snapshot produces copy-on-write
Snapshot；
If, it is determined that the data block relied in first snapshot by the data block in second snapshot；
The data block data relied in first snapshot by the data block in second snapshot is copied, to second snapshot
In corresponding data block.
2. the decoupling method of snapped volume according to claim 1, it is characterised in that whether the snapshot of detection first is pre-
Before deletion state, in addition to：
Snapshot is set to be pre- deletion state and be that the snapshot sets and deletes speed, wherein, all pre- deletion snapshots have phase
Same deletion speed, or each pre- snapshot of deleting have respective deletion speed.
3. the decoupling method of snapped volume according to claim 2, it is characterised in that also include：
Receive after deletion snapshot command, according to deletion speed set in advance by first snapshot and first snapshot
Data are deleted.
4. the decoupling method of snapped volume according to claim any one of 1-3, it is characterised in that also include：
For the data block of snapshot, bitmap is set, wherein, the initial bitmap of data block is 0 when creating snapshot, and snapshot data block is produced
Bitmap is revised as 1 during copy-on-write.
5. the decoupling method of snapped volume according to claim 4, it is characterised in that quilt in determination first snapshot
The data block that data block in second snapshot is relied on includes：
The bitmap of first snapshot data block is made into inverse；
The result of the first snapshot data bitmap block inverse and the second snapshot data bitmap block are made and computing；
Obtained bitmap is the data block relied on by the data block in the second snapshot in the first snapshot by 1 data block.
6. a kind of asynchronous snapped volume decoupling device, it is characterised in that including：
Detection module, for detecting whether the first snapshot is pre- deletion state；
Determining module, during for detecting the first snapshot for pre- deletion state and first snapshot generation copy-on-write, judges
With the presence or absence of the second snapshot dependent on first snapshot, if, it is determined that by second snapshot in first snapshot
In the data block that is relied on of data block；
Module is copied, for copying the data block data relied in first snapshot by the data block of second snapshot, is arrived
In the corresponding data block of second snapshot.
7. snapped volume decoupling device according to claim 6, it is characterised in that also include：
Removing module, is deleted after snapshot command for receiving, according to speed set in advance of deleting by first snapshot and institute
The data stated in the first snapshot are deleted.
8. snapped volume decoupling device according to claim 7, it is characterised in that also include：
Setup module, sets snapshot to be pre- deletion state and be that the snapshot sets and deletes speed, wherein, all pre- deletions are fast
Speed is deleted according to identical, or each pre- snapshot of deleting has respective deletion speed.
9. the snapped volume decoupling device according to claim any one of 6-8, it is characterised in that the setup module is also wrapped
Include：
Bitmap unit is set, for setting bitmap for the data block of snapshot, wherein, the initial bitmap of data block is when creating snapshot
0, bitmap is revised as 1 by snapshot data block when producing copy-on-write.
10. the snapped volume decoupling device according to any one of claim 9, it is characterised in that the determining module includes：
Judging unit, for judging whether the second snapshot dependent on first snapshot；
Arithmetic element, for when there is the second snapshot dependent on first snapshot, by first snapshot data block
Bitmap makees inverse, by the result of the first snapshot data bitmap block inverse and the second snapshot data bitmap block make with
Computing；
Determining unit, for obtained bitmap to be defined as in the first snapshot by the data block in the second snapshot for 1 data block
The data block relied on.
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